#include <stdio.h>
#include <unistd.h>

int main(int argc, char ** argv) {
    int i;
    for (i = 0; i < 100; ++i) {
        int pid = fork();
        if (pid == -1) {
            printf("error!\n");
        }
        else if (pid == 0) {
            printf("This is the child process!\n");
            sleep(10);
            return 0;
        }
        else {
            printf("This is the parent process! child process id = %d\n", pid);
        }
    }
    sleep(10);
    return 0;
}